Python: error installing postgresql-dev with python:3.8.2-alpine

[domdinicola]

using python:3.8.2-alpine I get unsatisfiable constraints when installing postgresql-dev
any advice?

`Sending build context to Docker daemon 94.09MB Step 1/30 : FROM python:3.8.2-alpine as builder ---> d5e5ad4a4fc0 Step 2/30 : RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories ---> Using cache ---> f7e2e8d8c33a Step 3/30 : RUN apk update ---> Using cache ---> 7893a9176908 Step 4/30 : RUN apk add --upgrade apk-tools ---> Using cache ---> 43554075b7c2 Step 5/30 : RUN apk add --update alpine-sdk ---> Using cache ---> b193f988b3ce Step 6/30 : RUN apk add postgresql-dev ---> Running in 530e765e6143 ERROR: unsatisfiable constraints: libffi-3.2.1-r6: conflicts: libffi-3.3-r2 satisfies: llvm9-libs-9.0.0-r1[so:libffi.so.6] .python-rundeps-20200324.025755[so:libffi.so.6] libffi-3.3-r2: conflicts: libffi-3.2.1-r6 satisfies: llvm10-libs-10.0.0-r2[so:libffi.so.7] The command '/bin/sh -c apk add postgresql-dev' returned a non-zero code: 9 Makefile:11: recipe for target 'release' failed make: *** [release] Error 9

[wglambert]

The edge repo's you're adding have libffi-3.3-r2, but it conflicts with the already installed libffi-3.2.1-r6 which is a dependency for Python

https://github.com/docker-library/python/blob/6ceac803dd9c260a2c530543f0806796183715c0/3.8/alpine3.11/Dockerfile#L50

Not using the edge repo works fine for installing postgresql-dev

Closing since this isn't an issue with the image and questions like these should be asked over at Docker Community Forums, Docker Community Slack, or Stack Overflow. Since these repos aren't really a user-help forum